中介真值程度度量，基于中介真值程度度量的图像分割插值与拟合，解方程，数据分析，用平面波展开法计算二维声子晶体带隙。- The true extent of the value of the intermediary measure, measure the true extent of the agency based on the value of image segmentation Interpolation and fitting, solution of equations, data analysis, Computation Method D phononic bandgap plane wave.